package com.example.demo;

import java.io.*;
import java.util.jar.JarEntry;
import java.util.jar.JarOutputStream;

public class FileToJar {
    static boolean flag = false;
    static File sourceFile = null;
    static FileInputStream fis = null;
    static BufferedInputStream bis = null;
    static FileOutputStream fos = null;
    static JarOutputStream jos = null;
    /**
     * 将存放在sourceFilePath目录下的源文件,打包成fileName名称的ZIP文件,并存放到zipFilePath。
     * @param sourceFilePath 待压缩的文件路径
     * @param jarFilePath    压缩后存放路径
     * @param fileName       压缩后文件的名称
     * @return flag
     */
    public static boolean fileToJar(String sourceFilePath, String jarFilePath,
                                    String fileName) {
        sourceFile = new File(sourceFilePath);

        if (sourceFile.exists() == false) {
            System.out.println(">>>>>> 待压缩的文件目录：" + sourceFilePath + " 不存在. <<<<<<");
        } else {
            try {
                File jarFile = new File(jarFilePath + "/" + fileName + ".jar");
                if (jarFile.exists()) {
                    System.out.println(">>>>>> " + jarFilePath + " 目录下存在名字为：" + fileName + ".jar" + " 打包文件. <<<<<<");
                } else {
                    File[] sourceFiles = sourceFile.listFiles();
                    if (null == sourceFiles || sourceFiles.length < 1) {
                        System.out.println(">>>>>> 待压缩的文件目录：" + sourceFilePath + " 里面不存在文件,无需压缩. <<<<<<");
                    } else {
                        fos = new FileOutputStream(jarFile);
                        jos = new JarOutputStream(new BufferedOutputStream(fos));
                        byte[] bufs = new byte[1024 * 10];
                        for (int i = 0; i < sourceFiles.length; i++) {

                            File f = new File(sourceFilePath + "/" + sourceFiles[i].getName());
                            if (f.isDirectory()) {
                                File[] files = f.listFiles();
                                for (File file : files) {
                                    File tempF = new File(f.getPath() + "/" + file.getName());
                                    if (tempF.isDirectory()) {
                                        jarfile(sourceFilePath + "/" + sourceFiles[i].getName() + "/" + file.getName(), jarFilePath, sourceFilePath);
                                    } else {
                                        // 创建ZIP实体,并添加进压缩包
                                        JarEntry jarEntry = new JarEntry(sourceFiles[i].getName() + "/" + file.getName());
                                        jos.putNextEntry(jarEntry);
                                        // 读取待压缩的文件并写进压缩包里
                                        fis = new FileInputStream(file);
                                        bis = new BufferedInputStream(fis, 1024 * 10);
                                        int read = 0;
                                        while ((read = bis.read(bufs, 0, 1024 * 10)) != -1) {
                                            jos.write(bufs, 0, read);
                                        }
                                    }
                                }
                            } else {
                                // 创建ZIP实体,并添加进压缩包
                                JarEntry jarEntry = new JarEntry(sourceFiles[i].getName());
                                jos.putNextEntry(jarEntry);
                                // 读取待压缩的文件并写进压缩包里
                                fis = new FileInputStream(sourceFiles[i]);
                                bis = new BufferedInputStream(fis, 1024 * 10);
                                int read = 0;
                                while ((read = bis.read(bufs, 0, 1024 * 10)) != -1) {
                                    jos.write(bufs, 0, read);
                                }
                            }

                        }
                        flag = true;
                    }
                }
            } catch (Exception e) {
                throw new RuntimeException(e);
            } finally {
                // 关闭流
                try {
                    if (null != bis) bis.close();
                    if (null != jos) jos.close();
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
        }

        return flag;
    }

    public static void jarfile(String path, String jarFilePath, String sourceFilePath) throws Exception {
        File[] files = new File(path).listFiles();
        for (File file : files) {
            if (file.isDirectory()) {
                jarfile(path + "/" + file.getName(), jarFilePath, sourceFilePath);
            } else {

                byte[] bufs = new byte[1024 * 10];
                // 创建ZIP实体,并添加进压缩包
                String tempPath = path.substring(sourceFilePath.length());
                JarEntry jarEntry = new JarEntry(tempPath + "/" + file.getName());
                jos.putNextEntry(jarEntry);
                // 读取待压缩的文件并写进压缩包里
                fis = new FileInputStream(file);
                BufferedInputStream bis = new BufferedInputStream(fis, 1024 * 10);
                int read = 0;
                while ((read = bis.read(bufs, 0, 1024 * 10)) != -1) {
                    jos.write(bufs, 0, read);
                }
            }
        }
    }
}
